Add GitHub workflow for building examples

.github/workflows/examples.yaml

@@ -0,0 +1,20 @@
+name: Build Examples
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  run_tests:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build All
+      run: |
+        cmake -S . -B build
+        cd build
+        make all